Questions tagged [missing-data]
The missing-data tag has no usage guidance.
41
questions
-1
votes
1answer
39 views
How to convert missing values to the mean of the other values in R? [closed]
I need to convert the missing values of a column in a dataframe with the rest of values of this column, grouped by Districts and Month.
This is a sample of my df1:
Date Day Month Year ...
1
vote
0answers
17 views
Geopackage drops fields during import [closed]
When I use the ogr2ogr -f command to create a geopackage the first layer imports correctly but every layer after that drops fields. Can anybody explain why it does this?
3
votes
1answer
133 views
Interpolating LiDAR intensity images in R?
I'd like to generate 0.5 m intensity images using lidR, but the resulting raster is full of pits. Here's a reproducible example:
library(lidR)
LASfile <- system.file("extdata", "MixedConifer.laz", ...
1
vote
2answers
438 views
Getting a masked raster with no NAs and sum pixels within overlaying polygon?
I have done an IDW interpolation in R for precipitation data following the routine of Manny Gimond (https://mgimond.github.io/Spatial/interpolation-in-r.html) to get precipitation inside a catchment.
...
1
vote
1answer
59 views
Placing Excel Data in ArcMap/ArcScene similar to Image Georeferencing
I have XYZ-dataset of Temperature Data in Excel, with no (Lat, Lon) added.
Every time when I try to display the Data in ArcScene the Programm tells me, that a Spacial Reference is missing (of course)....
1
vote
3answers
105 views
Missing feature from Shapefile
I have loaded a shapefile into QGIS that has been generated in a third party piece of software. When I view the attributes table, all items are there (20 survey lines), when I view the map only 19 ...
1
vote
0answers
124 views
Only some points visible in CSV layer
I understand that this question has been asked before in one form or another, but unfortunately those answers haven't been able to solve my issue.
I've imported a .csv file into QGIS and all the ...
1
vote
1answer
157 views
Georeferencer - GDAL is missing on the QGIS 3
OS - ArchLinux 64bits
SPECS - i3-3220 - 6gb ram
QGIS 3.0.3 installed as follow.
$ sudo pacman -S qgis gdal python-gdal python-psycopg2 python-owslib python-yaml python-pygments
$ yaourt -S python-...
0
votes
0answers
24 views
Point/Feature to Raster-unwanted Grid of missing Data raster Cells-ArcGIS10.5
I tried to convert some point data (points on a regular grid of 100m by 100m) with the Feature to Raster Tool and the Point to Raster Tool (Rastersize of 100m) but in the resulting Rasterfile there is ...
1
vote
1answer
200 views
QGiS - Values missing from graduated style
I'm trying to do the very simple/standard task of presenting points (and then polygons created from them) as a graduated colour style, however many points are missing, evinced from the lowest number ...
0
votes
1answer
324 views
Features show on data view, but not in Attribute table?
There are 966 points for tree data that was collected in the field. When I try to open the attribute table only 2 points' data show up. I've tried to create layer from selected, because when I choose ...
1
vote
0answers
107 views
Space-Time Principal Component Analysis with Missing Lat/Long Data [closed]
I am looking to run a space-time Principal Component Analysis on Shotspotter data from Brockton, MA: http://justicetechlab.org/data/. Shotspotter sensors record the timing, location, and number of ...
1
vote
2answers
1k views
Replace NA's with 0 for large raster data using R?
I want to replace all NA values in a large raster with 0. I found this answer:
Replace NA's with 0 for raster data using R?
#getting a raster
library(raster)
f <- system.file("external/test....
0
votes
1answer
186 views
Adding missing locations on OpenStreetMap programmatically for Android application?
i am working on android application using osm. Many locations are not on osm that google map providing. But i need to show all missing locations on osm also.
what can i do to solve this problem?
Can ...
1
vote
0answers
50 views
Missing Values in Crop identification using Python? [closed]
I am developing a Python based process that classify crops via time series analysis. Due to clouds there are many missing values. My problem is how to assign a value to these pixels that would be near ...
1
vote
3answers
475 views
ArcGIS Attribute Table - Latitude, no Longitude
I received a shapefile from an online source, and in the attribute table it shows a column and values for latitude; but there is nothing for longitude.
I have not used ArcGIS for some time, and I don'...
0
votes
1answer
213 views
Python add-in button tool giving saying missing toolbar when I add it onto my map?
I am looking to create a button that when clicked, clears feature classes and tables created from another tool. I set up the button and installed it but every time I add it to the map with a toolbar ...
4
votes
3answers
583 views
Merging one DEM into another to fill in missing data using QGIS?
I have a LiDAR dataset with some missing data right in the middle of my map. I would like to use a 5m DEM to fill in the missing areas.
Is there a way in QGIS to merge the two but only use the 5m ...
2
votes
1answer
673 views
R kriging cross validation returns NA for all prediction points?
I'm trying to cross-validate the results of an [auto]Krige output but for some unknown reason the results of both autoKrige.cv (automap package) and krige.cv (gstat package) return NA for all values (...
5
votes
1answer
287 views
Zones missing after running zonal statistics in ArcGIS Spatial Analyst?
I have a problem using zonal statistics in ArcGIS.
My raster contains values/data with 30m cells.
I had several vector layers, containing administrative subdivisions of Belgium. I have converted the ...
1
vote
0answers
74 views
Extracting specific OpenStreetMap tags in ArcGIS Desktop? [duplicate]
The purpose of my research is to look into public ITS (Intelligent Transport System). To do this in a realistic way I need not only the city map but also the public transport routes.
I work with ...
1
vote
0answers
71 views
Filling missing pixels of ASTER DEM
I need to perform hydrological analyses and map design purposes (hillshade creation) on a region far north. It is too northern to be covered by the SRTM DEM, therefore I am using the ASTER DEM. ...
1
vote
0answers
29 views
Generating missing yearly data, based on a more detailed temporal data set
I have several very large raster data sets of land use classifications (ie. forest, wetland, argicultural, etc).
The most comprehensive data spans 2009-2015. I have reclassified this data to match ...
0
votes
1answer
353 views
Filling null attributes with mean attributes of neighboring polygons using ArcGIS Desktop?
I have a layer of polygons, where in some polygons there is missing data (null). I would like to fill these missing attributes by the average attributes in neighboring polygons. Is there a simple way ...
3
votes
2answers
1k views
Error gap-filling Landsat 7 SLC-off with QGIS 2.18.3 on Windows 10
I am trying to gap-fill Landsat 7 SLC-off images with open-source software as explained in the comment below this post.
I'm new to QGIS and have almost no knowledge with Python (I'm a GIS novice ...
1
vote
0answers
77 views
Missing Observations in Zonal Statistics Tool
I am using zonal statistical tools. I have field boundary shapefile which has 1,062,063 observations.
I am using zonal statistical as table tool to obtain precipitation values from raster layer. ...
2
votes
0answers
55 views
Finding pre-processed MODIS products?
I am trying to recognize burnt areas based on some MODIS products and I just realized that I am missing a bunch pixels from the coastline masking. As you can understand that is an issue because I am ...
4
votes
0answers
129 views
Why do first returns have more blanks than last returns in LiDAR data? [closed]
I'm working on an ASCII LiDAR file that has the first and last pulse returns included.
Can anyone tell me why a first pulse return may come back with more blank spaces in the data than a last pulse ...
1
vote
1answer
48 views
QGIS - Have spreadsheet with col from 0% to 100% plus null want 100 bin gradient plus one more for null
Newbie alert. Have a spreadsheet with no geo; has a col with values in there from 0% to 100%, plus several blanks/nulls.
Ideally would like a 100 step (bin) gradient fill from 0 (100% black) to 100 (...
4
votes
1answer
700 views
How to generate missing points in GPS trajectories?
I have some GPS trajectories that include gps locations recorded on variable frequencies (every 1 min ,5 min , 20 min,etc.)using a geographic projection WGS84. In my work, i need a fine-grained GPS ...
2
votes
0answers
1k views
QGIS Polygons missing after saving edits
Right, I am slightly worried. I opened QGIS this morning to discover that part of the work I did yesterday was not there (the attributes where present in the table, but were not digitised anywhere on ...
0
votes
1answer
95 views
How can I find the missing data from the downloaded bulk TRMM data?
I have downloaded TRMM daily precipitation estimates for Indian Sub-continent from 1988 to present. I see that there are a lot of missing data days. I was wondering how can I possibly detect the daily ...
0
votes
1answer
377 views
Fusion Tables missing from Google Drive [closed]
Many of my Fusion Tables are missing off my Google Drive account, has anyone else experienced, and hopefully resolved, this issue?
1
vote
1answer
581 views
Parts of geometry disappearing in QGIS export to Illustrator PDF?
I'm having this issue with certain polygons when I export to PDF. Everything looks fine in QGIS, everything fine in print composer, everything fine in the PDF as viewed in Preview or Adobe Reader. ...
1
vote
2answers
563 views
Export GRASS raster as GeoTIFF : nodata values exported as -nan (what happens in R?)
I am using the package raster to work with GeoTIFF raster files which I exported from GRASS using r.out.gdal. GRASS assigned the value -nan to some raster files (type FLOAT32) for missing values. ...
3
votes
0answers
343 views
Missing data and negative predictions when kriging daily rainfall? [closed]
I want to perform the interpolation of daily rainfall data for 7 years. I am now working on python using arcpy module. I face several problems while performing interpolation
Some day there is no ...
2
votes
1answer
752 views
Kriging from raster with missing data in ArcGIS
I have MODIS satellite imagery that depicts a range of surface temperatures. However, many of the cells are missing values. I think I need to perform Kriging in order to obtain an average value for ...
1
vote
1answer
987 views
How to treat missing values as null
I have an excel file with missing values encoded as blanks and I want this excel file to be converted into DBF but with the conversion process, the blanks (missing values) become 0.
The reason I am ...
1
vote
1answer
261 views
ArcGIS: Assigning values to missing attribute data for line layers
I have a large road network layer with an AGE attribute associated per segment. In some occasions, I would have segments A -> B -> C with segment B with no value for the AGE field. In other ...
7
votes
1answer
348 views
Interpolating points observed with different time duration
I am doing spatial interpolation with a group of points.
Some points have complete observation of events:
for a period of 24 hours we have observed N events in each point. These points have N events....
8
votes
1answer
10k views
Replace NA's with 0 for raster data using R?
I am new in R. How can I replace NA's with 0 for my raster data which have spatial information?
